title: Great enhancements in the thermoelectric power factor of BiSbTe nanostructured films with well-ordered interfaces.
abstract: An innovative concept of twin-enhanced thermoelectricity was proposed to fundamentally resolve the high electrical resistance while not degrading the phonon scattering of the thermoelectric nanoassemblies. Under this frame, a variety of highly oriented and twinned bismuth antimony telluride (BixSb2-xTe3) nanocrystals were successfully fabricated by a large-area pulsed-laser deposition (PLD) technique on insulated silicon substrates at various deposition temperatures. The significant presence of the nonbasal- and basal-plane twins across the hexagonal BiSbTe nanocrystals, which were experimentally and systematically observed for the first time, evidently contributes to the unusually high electrical conductivity of ~2700 S cm(-1) and the power factor of ~25 μW cm(-1) K(-2) as well as the relatively low thermal conductivity of ~1.1 W m(-1) K(-1) found in these nanostructured films.
authors.affiliation: Department of Materials Science and Engineering, National Chiao Tung University, Hsin-Chu 30010, Taiwan, ROC.
authors.forename: Hsiu-Cheng
authors.initials: HC
authors.lastname: Chang
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Chen
authors.forename: Yung-Kang
authors.initials: YK
authors.lastname: Kuo